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Year-Over-Year Growth Calculator

See how much something grew year over year.

Result

15.00%
$72,000.00
1.15x

How it is calculated

The tool compares a figure with the same figure one year earlier: YoY growth % = (current − previous) ÷ |previous| × 100. It also shows the plain change current − previous and the multiple current ÷ previous, where 1.15x means the figure is 15% higher. Previous value is the figure from the same period last year, and the current value is this period's figure, in the same unit. Previous value cannot be zero because growth from nothing has no percentage. A drop gives a negative growth rate. The change line is always formatted with a dollar sign, so for counts or other units read it as a plain number. For negative starting values the tool divides by the absolute previous value, so read those results with care.

Worked example

A shop had sales of 480000 in the same quarter last year and 552000 this quarter. Step 1: change = 552000 − 480000 = $72,000.00. Step 2: divide by last year's figure: 72000 ÷ 480000 = 0.15. Step 3: multiply by 100, so growth is 15.00%. Step 4: the multiple is 552000 ÷ 480000 = 1.15x. If sales had fallen to 360000 instead, growth would be -25.00% and the multiple 0.75x.

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Common mistakes

  • Comparing with the previous month or quarter instead of the same period last year. That is period-over-period growth, and it includes seasonal swings.
  • Swapping the two fields. A 15% rise then shows as a 13.04% fall, because the base changes.
  • Mixing units or scope, such as last year's revenue with refunds taken out against this year's gross revenue.
  • Calling a rise from a very small base impressive. Going from 10 to 50 is 400% growth but only 40 units more.
  • Using last year's figure of zero. The tool returns nothing, because a percentage growth from zero is undefined.

About this calculator

Year-over-year (YoY) growth compares a metric in the current period against the same period one year earlier, expressed as a percentage: YoY growth = (current value − prior-year value) / prior-year value × 100. Comparing against the same period last year, rather than the immediately preceding period, cancels out seasonal swings — a retailer's December sales are naturally compared to last December, not last November.

This metric is a staple of financial reporting: companies quote YoY revenue growth in earnings releases, SaaS businesses track YoY growth in monthly or annual recurring revenue, retailers report same-store sales YoY, and economists watch YoY changes in GDP or inflation.

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